Pascal (Lazarus/Delphi)

Create PKCS7 Signed File (.p7m)

See more Encryption Examples

Demonstrates how to sign a file to create a .p7m that contains both the file contents and the signature. Pascal (Lazarus/Delphi)

program ChilkatDemo;

// Demonstrates using the Chilkat Pascal wrapper via the C bridge DLL.
// Builds as a console application under Lazarus (FPC) or Delphi.

{$IFDEF FPC}
  {$MODE DELPHI}
{$ENDIF}
{$APPTYPE CONSOLE}

uses
  {$IFDEF UNIX}
  cthreads,
  {$ENDIF}
  SysUtils,
  CkDllLoader,
  Chilkat.JsonObject,
  Chilkat.Cert,
  Chilkat.CertStore,
  Chilkat.Crypt2;

// ---------------------------------------------------------------------------

procedure RunDemo;
var
  success: Boolean;
  crypt: TCrypt2;
  certStore: TCertStore;
  jsonCN: TJsonObject;
  cert: TCert;
  inFile: string;
  outFile: string;

begin
  success := False;

  //  This example requires the Chilkat API to have been previously unlocked.
  //  See Global Unlock Sample for sample code.

  crypt := TCrypt2.Create;

  certStore := TCertStore.Create;

  //  Load a PFX file into a certificate store object.
  success := certStore.LoadPfxFile('myPfx.pfx','pfxPassword');
  if (success <> True) then
    begin
      WriteLn(certStore.LastErrorText);
      Exit;
    end;

  //  Get the certificate by subject common name.
  //  This should be the cert within the PFX that also
  //  has a private key (also stored within the PFX).
  jsonCN := TJsonObject.Create;
  jsonCN.UpdateString('CN','myCert');
  cert := TCert.Create;
  success := certStore.FindCert(jsonCN,cert);
  if (success = False) then
    begin
      WriteLn(certStore.LastErrorText);
      Exit;
    end;

  //  Tell the crypt object to use the certificate for signing:
  success := crypt.SetSigningCert(cert);

  //  Sign a file, producing a .p7m as output.
  //  The input file is unchanged, the test.p7m contains the 
  //  contents of the input file and the signature.
  inFile := 'test.txt';
  outFile := 'testp7m';
  success := crypt.CreateP7M(inFile,outFile);
  if (success <> True) then
    begin
      WriteLn(crypt.LastErrorText);
      Exit;
    end;

  WriteLn('Success!');


  crypt.Free;
  certStore.Free;
  jsonCN.Free;
  cert.Free;

end;

// ---------------------------------------------------------------------------

begin

  try
    RunDemo;
  except
    on E: Exception do
      WriteLn('Unhandled exception: ', E.ClassName, ': ', E.Message);
  end;

  WriteLn;
  {$IFDEF MSWINDOWS}
  WriteLn('Press Enter to exit...');
  ReadLn;
  {$ENDIF}
end.